HP 40G manual Plot the graph, To move cursor to the intersection

3.Use the Plot view to find an initial guess for T. First set

appropriate X and Y ranges in the Plot Setup. Since we have an equation, X = V ⋅ T + A ⋅ T2 ⁄ 2 , the plot will

produce two graphs: one for Y = X and one for

Y = V ⋅ T + A ⋅ T2 ⁄ 2 . Since we have set X = 30 in this example, one of the graphs will be Y = 30 . Therefore, make the YRNG –5 to 35. Keep the XRNG default of –6.5 to 6.5.

>6+,)7@SETUP-PLOT￿

*e,>￿￿￿@5 >(17(5@ 35 >(17(5@

4.Plot the graph.

>3/27@

5.Move the cursor near the positive (right-side) intersection. This cursor value will be an initial guess for T.

*A,￿to move cursor to the intersection.

The two points of intersection show that there are two solutions

for this equation. However, only positive values for x make sense, so we want to find the solution for the intersection on the right side of the y-axis.

6.Return to the Numeric view.

>180@

Note: the T-value is filled in with the position of the cursor from the Plot view.

7.Ensure that the T value is highlighted, and solve the 62/9(aequation.

Solve aplet 7-9